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Title: Pressure dependence of the refractive index in wurtzite and rocksalt indium nitride

We have performed high-pressure Fourier transform infrared reflectance measurements on a freestanding InN thin film to determine the refractive index of wurtzite InN and its high-pressure rocksalt phase as a function of hydrostatic pressure. From a fit to the experimental refractive-index curves including the effect of the high-energy optical gaps, phonons, free carriers, and the direct (fundamental) band-gap in the case of wurtzite InN, we obtain pressure coefficients for the low-frequency (electronic) dielectric constant ε{sub ∞}. Negative pressure coefficients of −8.8 × 10{sup −2 }GPa{sup −1} and −14.8 × 10{sup −2 }GPa{sup −1} are obtained for the wurtzite and rocksalt phases, respectively. The results are discussed in terms of the electronic band structure and the compressibility of both phases.
Authors:
 [1] ;  [2] ;  [3] ; ;  [1] ; ;  [4]
  1. Institut Jaume Almera, Consell Superior d'Investigacions Científiques (CSIC), Lluís Solé i Sabarís s.n., 08028 Barcelona, Catalonia (Spain)
  2. (Spain)
  3. MALTA-Consolider Team, Departament de Física Aplicada, ICMUV, Universitat de València, c/Dr. Moliner 50, 46100 Burjassot, València (Spain)
  4. Faculty of Science and Engineering, Ritsumeikan University, Shiga 525-8577 (Japan)
Publication Date:
OSTI Identifier:
22395475
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CHARGE CARRIERS; COMPRESSIBILITY; CUBIC LATTICES; DIAGRAMS; ENERGY GAP; FOURIER TRANSFORMATION; INDIUM NITRIDES; INFRARED SPECTRA; PERMITTIVITY; PHONONS; PRESSURE COEFFICIENT; PRESSURE DEPENDENCE; PRESSURE RANGE GIGA PA; REFRACTIVE INDEX; SPECTRAL REFLECTANCE; THIN FILMS